Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 45, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202204612
Keywords
anti-fouling; gel networks; nonsolvent-induced phase separation; oil; water separation; surface segregation
Categories
Funding
- National Natural Science Foundation of China [52173068]
- Sichuan Science and Technology Program [2021YFH0023, 2022YFS0006]
- Guizhou Science and Technology Program [2020-4Y189]
- Guangdong Basic and Applied Basic Research Foundation [2022A1515010821]
- International Science and Technology Cooperation Project from Chengdu municipal government [2019-GH02-00037-HZ]
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An improved one-step NIPS strategy is proposed to fabricate anti-fouling PES based membranes with hierarchical structures and an internalized gel network. The membrane exhibits super-hydrophilic/underwater super-oleophobic properties and shows high efficiency and good recyclability in separating oil-in-water emulsions. The improved NIPS methodology allows dip coating of various porous substrates and exhibits good anti-fouling ability.
The porous polymeric membranes prepared by conventional nonsolvent-induced phase separation (NIPS) suffer from notorious fouling pollution during oil/water separation. Herein, an improved one-step NIPS strategy is proposed to fabricate anti-fouling polyethersulfone (PES) based membranes that bear hierarchically spherical structures on the interface and an internalized gel network. More specifically, the hydrogen bonding between hydrophilic additives of polyvinylpyrrolidone (PVP) and tannic acid (TA), as well as Fe3+-TA coordination interaction are orchestrated to modulate their surface segregation behaviors during NIPS, leading to in situ generation of the interfacial assembled nanospheres and embedded gel networks in the PES matrix. Thanks to the synergistic effect of these dual antifouling barriers, the optimized membrane exhibits super-hydrophilic/underwater super-oleophobic properties, and displays high efficiency as well as good recyclability in separating surfactant stabilized oil-in-water emulsions. In addition, this improved NIPS methodology allows dip coating of various porous substrates to separate diverse oil/water mixtures, which also exhibits good anti-fouling ability. Basically, this study will provide new insights for design of anti-pollution oil/water separation materials by the phase inversion method.
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